Drilling machine



Feb. 28, 1928.

J. W. STOLLE DRILLING MACHINE Filed April 2} 1924 3 Sheets-Sheet l INVENTOR WM ATTORNEY) J. W. STOLLE DRILLING MACHINE Feb. 28, 1923.

Filed April 2, 1924 3 Sheets-$hest 2- I MTTORNCYS Feb. 28, 1928. 1,661,017

J. W. STOLLE DRILLING MACHINE Filed April 2, 1924 3 Sheets-Sheet 3 'L LE /0 ATTORNEYS Patented Feb. 28, 1928.

JOHN WILLIAM- STOLLE, F DAiNBURY, CONNECTICUT,.lASSIGiNOR?TO tTHJEVDAIIBUBY TION OFv CONNECTICUT.

DRILLING MACHINE.

Application filedApril 2, 1924. Serial Ho."703,624.

My inventionrelates to drillinginachines and has for its oh ect to PI'OVldQ lLTDQW and improvedn'iachine tor drllling wood win which thevoperation is automatic after" the wood is supplied to the machine. Itfurther has for'its object to PPOVlClQSHH-l] a machine in which the wood to be drilled isautoinatically supplied thereto. It further has for itaivohjectto produeesa machinewhich is simple in construction andrapid in operation.

ItKfllltllCVdllS for its ohjectto provide :a

ina chine withnieans' tor expediting its operationandproviding against accidents to the inachin mmd to the attendant thereof.

The following is a description of=an emhodin'ient of my: invention, reference being had tothe accompanying drawings, in which,

Figul shows a longitudinal view, partly in section, of awn'iachine which is, autmnatic as to certain of its operations;

.xFig. fl isiasectionot thcx anie on the line 242, Fig. 1;

mFig. 3 is a section on the line 3I'3,JFig.1 1; :rFig. dis a section on the linee ee vFig. 1; Fig. 5 an enlarged detail View of the end portion oi the drill used inaniy ma chine;

:F i g; dis an end .view-o't the drill; Fig. 7 is a section on the line 7--7, Fig. 5; Fig. 8 shows the n'iachine of Fig. "1

equipped with means for automatically i ceding the wood thereto to be drilled i Fig. 9 is:a section on the line 9-*9, Fig. 8; Fig. 10 shows a 'sectional viewof portions shown in Fig. 9 ina different actuated. post tion;

Fig. Elisa section oirtlieeliiie 11 11, Fig.8; I

Fig. '121Scit section of the driving chuck with-the parts .in operative position when ia piece of wood 'i'shelng'drilled;

Fig. 13 is a similar sectional view ofthe check when the wood: is removed and 14: is :a plan view of. the 'ifeeding' means for supplying pieces of wood to be drilled oneat a time and discharging the same.

Referringiniore particularly to the drawings 2 is a bed oi? the drilling inahhine having thereon a head-stock 4 provided with i a rotatable shaft 6 driven hy: arpulley 8. and 13121 'ided with a chuck iioriholding the wood. lh. flchuck consists of a haseunemheritlO and a face 'nieinherIIQ, the .ilace :nieniber having a conioal. blockreceiving recess provided 'Wlth-1:'il)S 14. The chuck base-is provided with a projection l. 16 hehind whioh lies" the flange 1 8-ot' themovable face member 12gthis flange and projection being so related that the movahle:face is stree to move slightly axially relatively to the loase. The purpose of: this construction is to-provide a face member which can he stopped andheldfrom rotation while the base member 10 is continuing to. revolve. This enablesthe bloclc of ovood to be: drilled to be-easily inserted and qtnioved without slowing down the driving plilley 8;

2()is a support slidingly. inounteduipon the base and provided with a conical recess 22 constituting a centering bearing whose aXlSlllSCl Il line with the axis oi the centering (01110211 recess Miami the axis of the shaft ti, these two conicaluecesses 14 andx22 acting to center a piece of wood.Qiclampedhetween them. 26 is a support or cradlewtoflwhioh blocks of Wood, such as. 24-. are supplied one at:a time. This"suppoTtQGwholds therblock of Woodiin suohposition that when the slidmg support :20 is moved toward the chuck nieinberthe"conical reeessesin the sup ort 20 and chuok nieniberwilliengagethe en sof thehlock of WVOOdL and automatically lift and center it so that-its axisis inzilineuwith the axis of the shafti 6. mA- spring:28i adjustably secured to the stationarysupport 26"is connectedto the support .20: and "when the-supportQOis retracted tendsto movesand'when free to do sodoesmove it toward the chuck so as to cause it to lift the block of WOOd 24 from the supportfl26iand centerit, fiSlfibOVB described. The. spring 28 can l beiadjusted so as :to produce the desired clainpingw action.

30 is a sliding tail-stock which. carriesn drill 32, the forward end of which fitswithin the guide opening 34 of the supportJQO. This drill has a butt endwhich is held'within the tail'stock 30by a-set screw 36 and=is thereby held against rotation. The drill 32 has a passage extending from end to end through which Water or other fluid can be is provided with a vent cock 40, if desired.

The tail-stock 30 isautomatically iretracted andpropelled by ascrew 42 mounted in suitable bearings and engagingia nut 44 oarried by a portion projecting downwardly from the tail-stock 30. As the screw 42 is verse the same periodically, I provide thereon two loose driving pulleys 46 and 48 simultaneously driven in opposite directions by belts 50 and 52. If the belts are driven at the same speed the pulle 48which causes the screw 42 to revolve so as to make the tail-stock 30 move to the left is preferably the larger, with the result that the forward working movement of the drill is slower than the ret acting movement. The pulleys 46 and 48 are loosely mounted upon the shaft 42 and are alternately connected thereto by the ordinary sleeve clutch 54 splined upon the shaft of the screw 42 and provided with shifting yoke 56. This shifting yoke is operated by a rod 58 having thereon adjustable abutments (30 and 62 which are alternately engaged by the projection 64 carrying the nut 44. This rod is connected by'a lever 66 to a link 68 which is pivotaily connected to the lower end of the shifting lever or yoke 56. The position of the rock shaft 66v is controlled by a spring 70 pivotally connected thereto, the pivot point being located so that as the rock lever is shifted from one position to the other the pivotal connection of the spring lies first on one side and then on the other side of the dead center of: the pivot 7 2.

In order that the support 20 may be automatically retracted I provide a rod 74 secured thereto and having upon its end an adjustable abutment- 76. This rod passes through the tail-stock 30 and is engaged by that support during the latter part of the period. of the backward movement of the tailstock 30 so that during that period the support 20 will be retracted, thus releasing the block 24. After the tail s ock 30 is moved forward to the position shown in Fig. 1 the support 20 will have been moved forward by the action of the spring 28 so as to clamp theblock 24 as before described.

In the pipe 38 supplying liquid, I provide a valve 78 which is actuated by an ad justable stop 80. This valve is actuated by the engagement of the crank 82 connected to the plug of the valve 7 8 with the stop which moves the plug to closed position, and by the action of a spring 84 located between an extension on said arm and an abutmrsit 86 carried by the valve casing. he stop 80 closes the valve during the latter part of the backward movement of the tail-stock 80 andpreferably before the support 20 has been retracted. vThe disengagement of the arm 82 from the stop 80 permits the s ring 84 to open the valve, moving the arm 81 until it "engages the stop 88, the adjustment preferably being such that the valve is opened after the support 20 has fully moved forward to block clamping position. By adjusting the arm 82 or stop 80 the opening and closing of the valve may be accomplished when the point of the drill is at or just inside the rear end of the block 24. The result is that the supply of water to the drill 32 is cut off at all times except when a piece of .wood is clamped in drilling position.

One part of the valve 78 is connected to a pipe which will not interfere with the movements of the tail-stock 30, such for instance as a rubber hose 90 leading to a source of water under pressure (not shown). When the hose 90 is connected to the inlet of the valve 78 I mount the valve on the tailstock 30 and make the stop 80 stationary, as

shown. That is the preferred arrangement. I preferably use a pressure of from to 700. pounds per square inch, which maybe simple hydraulic pressure, or may be supplied by a suitable pump of any well known construction provided that a safety lay-pass, which will permit the pump to operate when the valve 78 is closed, is user, such pumps being well known. 92 is a tank for receiving water during the drilling operation and when a pun 1p is used the suction 94 of the pump takes the water from this tank so that the water may be used over and over again.

I prefer to use water which is somewhat soapy.

With this apparatus all, the attendant has to do is to supply blocks of wood 24 to the support 20 and remove them therefron'i. The machine is rapid and positive in its action.

The drill is similar to that described in my copending application Ser. No. 094,521, filed February 23, 1924 and when operated as described will drill straighthole in a piece ,of wood in a remarkable manner. I

The drill is provided with. cutting faces 96 and 98 and its edge 100 is sharpened so as to produce a shaving rean'iing action which is of great importance in enabling the drill to drillv a straigz ht hole. The face of the drill is slanted back. The drill is provided with channel 102 which extends backward so as to always end to the right of the support 20 through which channel the water supplied to the drill discharges carrying the cuttings with it. I

In order to supply the pieces of wood to be drilled automatically I provide a support 104 carried by the bed of the machine which carries a supply chute 106 and a discharge chute 108. I also provide two pairs of escapement members 110 and 112, each pair fixedly mounted upon shafts 114 and 116, respectively. To the ends of these shafts are connected crank arms 118 and 120 which are connected together by a link 122. The shafts 114 and 116 are journaled in brackets 124 and 126 secured to the base of the :machine. Mounted upon an extension 128 from the bracket 124 iszax bell'crankr130 having a fork 132 which embraces the .arm 120 of the other-arm of the bell crankhav- .ing a slot ori'ecess 134 in which playsa pin rested by a stop 142.

The result of this construction is that when the support- 20 is in forward clamping position, theescapements 110and '112 are in the position shown in Fig. 9 in which case the escapement 112 cooperates with the sup port104, to form a cradle for a piece of woodiabout to be drilled. When, however,

"the support 20 is retracted the bell crank 130 moves the cscapements 11'lli0 the positionv shown inFig. 10ra1s1ng the front teeth so asflto discharge the block which has just been 'drillednnd permitting another block toescape from the front teeth of the es- 4" 'eapementil10and be arrested by the back teeth of the escapement 112. y The back teeth ofwthe"escapement 110 simultaneously on gages a rear block." WVhen the support 20 again DIOVGS forward the escapements are restoredto the position shown in Figs 9 permitting the blocks which were in engagement with the back teeth thereof to assume the positlons shown 1n F1 g; 9 an contact with the front-teeth. The elongated opening 134 in the bell crank permits a slight movement of the support 20 sufficient to release the block 24 before the cscapelnents 110 and 112 are actuated, that is,"the escapements are moved into the position shown in F lg. 10, during the latter part of the backward stroke of the support 20. On accountof the spring 140,howe"er, they aremoved into the positionshown in Fig. 9 during the first part of the return movement of the support- 20 so that new blocks are brought into engagement-with the front teeth and a new block is located in front of the conical recesses of the bearing and chuck before it is engaged by i the conical surfaces thereof. \Vhen the block,'so positionechis engaged by the conical surfaces-of the support-20w and the driving chuck it is automatically" lifted from the cradle and centered between them in line with the axrs of the drill and shaft 6 and lifted up so as to be slightly removed from the upper surface of the support 104 as shown in Fig. 9. 3 I

In order to insure safety for the machine and for the attendant, the shaft of the ma chine beingdriven athigh speed, say 1800 to 2500 R. P. M., I providean automatic brake for the separable face 12 of the chuck,

the, same consisting o fga. pair of brake shoes 1.44 pivoted to the head stock at 146 and drawn togetheriby a spring 148. "These 1 support. 20. 1 porti0n154 oftuniform diameter and with cam shoulders 156 which cam shoulders engage similar cooperating surfaces upon the arms of the brake shoes 144 just before the brake shoes embrace-the sides of the movable chuckface 12 and whenever thesupport20 f1s retracted (3111158111 braking effect with rela=- tionthereto so as to hold the movable face 12 .from turning when the chuck base is revolved. In order toiautomatically remove this braking effect I provide an actuating rod 150 adjustably mounted at 152 in the This rod is provided with a support 20 completes its movement tothe left, so that just before a block 24 is clamped between the conical faces of the support 20 and the rotating chuck the braking effect upon the movable face 12 s removed.

In the'machine shown in Fig. 8 the projection which is engaged by the flange 18 of the face member 12 is formed of balls 155 cooperating with suitable raceways so as to form a ball-bearing connection.

In the machine shown in Fig. 8 I have shown an adjustable weight 158 connected "bya cable 160 extending over the pulley 162 to the movablesupport 20, the same being the wellknown equivalent of the adjustable spring shown in Fig. 1.

163 is a dofiing spring which ejcctsthe block24fro1n the chuck face 12 when the support 20'is retracted.

In operating the machine the shaft 6 driven at a high rate ofspeed such as 1800 to 2500 R. P. M. and the screw 42 is driven in I its forward feeding movement at such a rate as to cause the tail-stock to move rapidly. TlllS movement may beat the rate of a foot in five seconds. If the machine is to be supplied with material manually the attendant a '12 under the desired clamping pressure, thus actingto automatically raise the block 24 out of contact with the support 26 and aline its axis with the drill. The chuck driven by the pulley 8 then causes the block 24 to revolve rapidly. Simultaneously with the clamping act-ion the valve 7 8 is opened permitting water to be discharged at the point of the drill and thereupon the drill continuing to move forward enters the block, drilling the hole and discharging the cuttings through the channel 102. When the drill has penctrated completely through the wood or to the desired depth the stop 60. being suitably adjusted, is engaged by the projection 44 and the rotation of the screw 42 is thereupon reversed causing the drill to be drawn outward. Vhcn the tail-stock carrying the [frill -approaches the end of its backward movement it engages the abutment 7 Gand connection l thus retracts the support 20 slightly per1nitting the block 24 to drop down upon the support 26 and causing the valve 78 to be actuated by the stop 80 so as to be closed and out 01f the supply of water to the drill.

With this simple form of mechanism high speed of operation may be maintained.

The operation of the machine shown in F 8 is the same as that shown in Fig. 1 with the addition that when the support 20 begins to be retracted the movable face 12 is auton'iatically stopped by the brake shoes I l- 1, above described, this being controlled by a rod 150 and that the blocks to be drilled are automatically supplied and discharged by the chutes 106 and 108 and the detents 110 and 112, the construction and operation of which has been heretofore described. The rear teeth of the escapements act as pushers upon the blocks innnediately ahead of them to aid in discharging such blocks: when the front teeth are lifted. 'lhis automatic feed permits more continuous work and a higher speed with less supervision.

he drill 32 wnich i have shown is exaggerated in diameter for clearness of illustration. My invention is a great value in drilling relatively long holes with drills three eighths in diameter and even suuller. The drills obviously can be oiivlarger diameter.

As will be evident to those skilled in the art, my invention permits of various moditications without departing from the spirit thereof or the scope of the appended claims.

lVhat i claim is:

1. In a drilling machine, the combination of a. iixed head stock, a rotatable chuck carried thereby, a longitudinally movable tail stock and drill fixed therein, a movable support having a work-supporting bearing tacing said chuck and located between said chuck and tail stock, means for automatically reciprocatii aid tail stock, a lost motion een said tail stock and support whereby said tail stock, during the latter part of its-rearward movement, moves said support in the same rearward direction, and means tending to move said support toward said head stock, said means being releasedby said tail stock during the first portion of its forward movement and permi ng said support to be retracted by said tan stock during the latter part of the retracting movement of said tail stock.

2. in a drilling machine, the combination of a l stock, a rotatable chuck carried thereby, a tail stock, a drill fixed therein. a movable support having a work supporting bearing facing said chuck, means for reciprocating said tail stock, a lost motion connection between said tail stock and support, means tending to move said support toward said head stock, a cradle between said head stock and support, said cradle comprising escapement means adapted to feed the ar- *ticlesto be drilled, and means actuated by said support for actuating said escapements.

8. In a drilling machine, the combination of ahead stock, a rotatable chuck carried thereby, a tail stock, a hollow drill fixed therein, a movable support having a. work supporting bearing facing said chuck, means for reciprocating said tail stock, a lost m0- t on connection bet-ween said; tail stock and support, means tending to move said support toward said head stock, means for supplying fluid to said hollow drill, and means for automatically cutting 01f said fluid supply during the backward moven'ient of said tail stock.

4e. ln a drilling machine, the combination of a head stock, a rotatable chuck carried thereby, a'tail stock, a hollow drill fixed therein, a, movable support having a Work sup 'iorting bearing facing said chuck, means for reciprocating said tail stock, a lost motion connection between said tail stock and support, means tending to move said support tor 'd said head stock, means for sup- .ilying fluid to said hollow drill, and means aciuatal by said tail stock for cutting oil the supply of fluid during the backward movement of said tail stock.

in a drilling machine, the combination of a. head. stock, a rotatable chuck carried thereby, a tail stock, a hollow drill fixed therein, a movable support having a work supporting bearing facing said chuck, means for reciprocating said tail stock, a lost motion connection between said tail stock and support, means tending to move said support toward said head stock, means for supplying fluid to said hollow drill, and means actuated by said tail stock for cutting off the supply of fluid during the backward H'lOVGIHCHl) of said tail stock the lost motion connection between said tail-stock andsupport being such that the fluid is out off whenever said bearing support is retracted.

(3. In a drill, a head stock, a rotatable chuck carried thereby comprising a base portion and a work-engaging face portion adapted to frictionally engage and disensaid base portion so as to be alternately driven thereby and free to rotate continuously relatively thereto, and a brake adapted to engage said face portion for stopping the same when out of driving engagement with said base portion.

7. In a drill, a head stock, a rotatable chuck carried thereby comprising a base portion and a work-engaging face portion adapted to frictionally engage and disengage said base portion so as to be alternately driven thereby and free to rotate continuous 1y relatively thereto, and a brake adapted to engage said face portion for stopping the same when out of driving'engagement with said base portion, a work-supporting bearing, a reciprocable bearing support, and

lit)

said base; portion so as to be alternately driven-L thereby and. free t0, I'UttItQwCOHtIDLP ously; relatively \tl161'GtO,dlIlLl a brake adapted toa'engage said face portion for stopping the same when out i of driving. engagement with i said ;base portionppa worlesupporting bear-x controlling the applicationfandirelease of said brake. Y 9.;I1i1. a. drilling machine, th e combination of a head stock, a rotatable chuck carried thereby, a tail stock, a hollow drill fixed therein, a movable support having a work supporting bearing facing said chuck, means for reciprocating said tail stock, a lost motion connection between said tail stock and support, means tending to move said support toward said head stock, means for supplying fluid to said hollow drill, means for automatically cutting off said fluid supply prior to the backwardmovement of said support and restoring it after the forward movement of said support.

10. I11 a drilling machine, the combination of a head stock,a rotatable chuck car ried thereby, a tail stock, a hollow drill fixed therein, a movable support having a work supporting bearing facing said chuck, means for reciprocating said tail stock, a lostmotion connection between said tail stock and support, and means tending to move said support toward said head stock, means for supplying fluid to said hollow drill, and means controlled by said tail stock for cutting ofl thefluid supply during the latter part of the backward movement of said tail stock and restoring it during the early part of the forward movement thereof.

11. In a drilling machine, the combination of a head stock, a rotatable chuck carried thereby, atail stock, a hollow drill fixed therein, a movable support havinga work supporting bearing facing said chuck, means for reciprocating said tail stock, a lost motion connection between said tail stock and support, means tending to move said support toward said headstock, means for supplying fluid to said tail stock and drill, a valve carried by said tail stock for controlling said fluid supply, said valve tending to open, and a stationary abutment engaged by said valve during the latter part of its backward movement and acting to close the same through such engagement.

12. In a drilling machine, the combination of a stationary head stock, a rotatable chuck a rcciprocablebearing; support, a re- Clpl'OCZtlDlevtflll: stock, a drill carried thereby, andumeansconnected EWSLI-Itl tail stock 1' for;

carried thereby, a llllOVtlillU tail stockandv drill fixed therein, annumrblc supporthaving a :work-supporting bearing facing said chucks and located between said chuckvand said tail stock, means for automatically reciprocatin; said tail st alost motion connection linking said tail stock and support together whereby said tail stock. during the latter part of its rearward movement, II'IOVLS said supi iort in: thcwsame rearward direction, meanslending to niovesaid support toward said headstock, said means being released. byisald tailstockduring the first portion of its forward movement and permitting said supportto be retracted by said tail stock during the latter part oi the retracting1novement of said tail stock, and a cradle between 1 saidjxtarlvstock and support, Stilk'l chuck and;

bearing having opposing conical ifaces 8X. tending-below the bottom of said cradle and whose axes are in line with the axis of rotation of said chuck.

1,3. In a drill, a head stock, a rotatable chuck carried thereby comprising a base portion and a work-engaging face portion adapted to frictionally engage and disengage said base portion so as to be alternately driven thereby and free to rotate continuously relatively thereto, and a brake adapted to engage said face portion for stopping the same when out of driving engagement with said base portion, a work-supporting hearing, a reciprocablebearing support, a re ciprocable tail stock, a drill carried thereby, means connected to said tail stock for controlling the application and release of said brake, and an ejecting spring carried by said face portion.

14. In a drilling machine, the combination of a rotatable chuck, a drill support, a drill fixed therein, means for reciprocating said drill support, a work engaging bearing opposed to said chuck, a support therefor, means for autonnitically withdrawing and propelling said bearing support in timed relation to said drill support so that said bearing support is propelled to clamping position before the drill enters the article to be drilled and is retracted after the drill is withdrawn from said article when drilled, means for feeding fluid through said drill, and means for automaticallycutting off the fluid supply during the period of backward movement of said drill and restoring it during the early portion. of. the forward movement of said drill.

:15. In a drilling machine, the combination of a rotatable chuck, a drill support, a drill fixed therein, means for reciprocating said drill support, a bearing support opposed to said chuck and means for automatically withdrawing and propelling said bearing support in timed relation to said drill support so that said bearing support is propelled to clamping positionbefore the drill Ill?) enters the article to be drilled and is retracted after the drill is withdrawn from said article when drilled, and means controlled by said bearing support and actuated by said tail-stock for automatically feeding to said machine articles to be drilled.

15. In a drilling machine, the combination of a reciprocating drill support, ahollow drill carried thereby, a reciprocating bearing support, a rotatable chuck co-operating therewith, means for supplying fluid to said hollow drill through said drill support, a valve controlling said fluid supply, means controlling the opening and closing of said valve, one of the two last mentioned elements being stationary andthe other being carried by one of said supports and moving therewith so that said valve is closed when said last mentioned support is retracted and opened when that support is moved forward a predetermined amount.

17. In a drilling machine, the combination of a reciprocating drill support, a hollow drill carried thereby, a reciprocating bearing support, a rotatable chuck co-operating therewith, means for supplying fluid to said hollow drill through said drill support,

a valve controlling said fluid supply, means for controlling the opening andclosing of JOHN WILLIAM STOLLE. 

